Wire Lan Racks are an excellent tool for organizing your computer and providing good ventilation.Here is a photo of what must be my computers (of course no one else would admit to having such a terrible setup)! This is a perfect example of how not to use a wire lan rack.
There is no organization. There are cables and other things all over the place. The monitor is on the floor, keyboards jammed in sideways. Can you type on a keyboard wedged between two computers?
If you spend your hard earned money on a lan rack (and you should if you have a few computers), please do not follow in my foot steps. Use the lan rack as an opportunity to organize your computers, cables and accessories properly.